Transmission and control therefor



Sept. 21, 1948. a. 5.1.5 MAY, JR

'I'RANSIISSION AND CONTROL THEREFOR 3 Shasta- Shoot 1 Filed March 8,1943 [711/671507 fi Byrqn LEM? p B. B. LE MAY, JR 2,449,608

TRANSMISSION AND CONTROL THEREFOR Q Filed larch 8 1943 3 Sh eetwSheot 2v VII/II/I/l/l/A war a 46 'll 76 77 a0 81"" x Q a sheets-shut s-V/////////////////////////////WW/// Patented Sept. 21 1948 UNITEDSTATES PATENT OFFICE TRANSMISSION AND CONTROL THEREFOR vBraudice ByronLe May, In, Muncie. Ind alsignor to Borg-Warner Corporation, Chicago,111., a corporation of Illinois Application March 8. 1948, Serial No.478.365

21 Claims. 1

comprising input and output shafts. a'hydrody-I namic coupling device, afriction-type clutch for connecting the input shaft and hydrodynamicdevice, a gear train adapted to be driven by the hydrodynamic device, apositive-type clutch for connecting a gear of the gear train with theoutput shaft for completing a power train between the hydrodynamicdevice and the output shaft and a brake for the driven element of thecoupling device for facilitating engagement of the positive-type clutch.Such a transmission is disclosed in the copending application of HaroldE. Carnagua Serial No; 486,293, filed May 10,1943.

It is an object of my invention to provide improved control means forsimultaneously engaging the two clutches in a transmission of the abovetype. It is also an object of my invention tb'provide improved means forengaging the positive-type clutch and disengaging the brake forthedriven element of the hydrodynamic device operated and .that thecontrol for the positivetype clutch shall include a valve connected witha source of fluid pressure such as a pump and also connected with thebrake and friction clutch.

It is another object of my invention to provide power means whereby thecontrol mechanically connected with the positive-type clutch i moved byfluid pressure, with the construction being such that the movable partof the positive clutch is moved distances corresponding with thedistances a control lever for the power means is moved.

My invention consists of the novel constructions, arrangements anddevices to be hereinafter described and claimed for carrying out theabovestated objects and such other objects as will appear from thefollowing description of a certain preferred embodiment illustrated inthe accompanying drawings wherein:

Fig. 1 is a diagrammatic illustration of a trans-'- misslon and controlmechanism therefor embodying the principles of my invention;

Fig. 2 is a side view of the transmission Fig. 3 is a sectional viewtaken on lines 3-3 of Figs. 2 and 5;

Fig. 4 is a sectional view taken on lines 4-4 of Figs. 2 and 5; and

Fig. 5 is a sectional view taken on line 6-5 of Fig. 4.

Like characters of reference designate like parts in the several views.

The illustrated transmission comprises an input shaft iii, an outputshaft ii, an intermediate shaft is and a countershaft i3. The inputshaft iii is adapted to drive a pump it of any suitable construction bymeans of gears it and i6, and the shaft is connected with a frictionclutch i! which when engaged functions to connect the shaft iii and thedriving element it of a hydrodynamic coupling device it. The clutch I!may be of any suitable construction so as to be engaged by fluid underpressure which maybe applied through a fluid line 20 suitably connectedwith the clutch. The hydrodynamic device is is preferably of the torqueconverter type and comprises, in addition to the driving element [8, adriven element 2i and a stator element 222. The driven element at isconnected with the intermediate shaft il. and the stator element 22 isconnected through a one-way brake is with a stationary shaft 24. Theone-way brake 28 functions to allow the stator element 22 to rotatefreely in a forward direction, but the brake prevents rotation of thestator element in a reverse direction. The coupling device it is ofwellknown construction and functions to drive the element 2i and therebythe shaft H at a lower speed but with greater torque than the drivingelement ill and shaft ill are driven. A clutch 25 of any suitableconstruction is preferably provided for connecting directly the shaftsl0 and it and locking up the torque converter is when the clutch ll isengaged.

The shaft I! has fixed thereon a gear 26 which is in mesh with a gear 21mounted on the shaft it by means of a one-way clutch 28 and a hubmember-28. The shaft is has fixed thereon a. gear I0 which is in meshwith a gear 3i rotatively disposed on the output shaft ii. The gear 3!is providedwith clutch teeth 82 with which a set of teeth on a clutchmember 33, which is slidablyg t and non-rotatably disposed on a hubmember 34 fixed to shaft I I, are adapted to mesh. The teeth 32 and theclutch member 33 form a positive type clutch for connecting the gear 3|and shaft ll as is apparent. The one-way clutch 2B is of suchconstruction that there is a, complete power train between the shafts l2and II with teeth on the clutch member 33 being interengaged with theteeth 32 whereby the shaft H is driven in the forward direction when theshaft i2 is driven in such direction. A clutch 35 of any suitableconstruction is preferably provided for locking up the one-way clutch28.

A gear 36 is fixed on the shaft I3, and the gear is in mesh with anidler gear 31 which in turn is in mesh with a gear 38 rotatably disposedon the output shaft II. The gear 38 is provided with clutch teeth 39which are adapted to interengage with teeth provided on the clutchmember 33, and the teeth 39 and the teeth on the clutch member 33 form apositive type clutch for connecting the gear 38 and the shaft H as isapparent.

vA clutch 40 actuated by any suitable means is provided for connectingdirectly the shafts l2 and I I. The clutch 40 comprises a drum-likeportion rotatable with the shaft l2, and a brake .42 is provided foracting on the portion 4|. The brake 42 is adapted to be brought intoengagement on the portion M by means of an operator 43 which is actuatedby fluid pressure applied to the operator through a conduit 44.

The illustrated transmission may be controlled to provide three speedsin forward drive and one speed in reverse drive. Low speed forward driveis obtained when the positive clutch comprising the clutch member 33 andteeth 32 is engaged and the clutch H is engaged. The brake 42 ispreferably utilized for stopping rotation of the gear 3! prior toengagement of the member 33 with teeth 32 to prevent clashing of teeth.The drive is then from shaft to, through clutch l1, hydrodynamic devicef9, shaft I2, gears 26 and 21, one-way clutch 28, hub member 29, shaftl3, gears 30 and 3!, teeth 32, clutch member 33 and hub 34 to shaft ll.Intermediate speed in forward drive may be obtained by thereafterengaging clutch 4 with the clutch 35 disengaged, and the drive is thenfrom shaft I0, through clutch it, torque converter l9, shaft i2, andclutch 46 to shaft Ii. In this speed, the clutch 28 overruns as isapparent. High speed in forward drive may thereafter be obtained byengaging clutch 25 to lock up the torque converter l9, and the drive isthen from shaft I9, through clutch 25, shaft l2 and clutch 40, to shaftII. A drive in reverse may be obtained by engaging teeth on the clutchmember 33 with the teeth 39 and engaging the clutch H with clutches 25and 46 disengaged. The brake 42 ispreferably utilized for stoppingrotation of gear 38 prior to engagement of member 33 with teeth 39 forpreventing clashing of the teeth. The drive is then from shaft l0,through clutch l1, torque converter l9, shaft 12, gears 26 and 21,one-way clutch 28, hub member 29, shaft 13, gears 36, 31 and 38, teeth39, clutch member 33, and hub 34, to shaft II.'

My improved transmission control mechanism is provided for controllingthe clutch H, the brake 42, and the clutch member 33, and reference maybe made to Figs. 2 to 5for illustration of the mechanism. A yoke member45 fitting in a suitable groove formed in the clutch member 33 isdisposed in a sleeve 5 which is fixed in a cylindrical cavity formed ina valve block 51 suitably fixed with respect to the housing 48. Itwill'thus be apparent that the shaft 46 and yoke member 45 are supportedby the valve block 5! in addition to the bearing 41, and stilladditional support for the yoke member 45 is provided by a rib 52 fixedwith respect to the housing 48 and fitting'in a groove formed in theyoke member. The yoke member 45 and clutch member 33 are movable withthe shaft-46, and the yoke member and clutch member may be moved toengage teeth on the clutch member with either the teeth 39 or 32 bymovement of the shaft 46.

The sleeve 56 is provided with openings 53, 54, 65, 56, 51, 58, 59, 66and 8|. The opening 60 is elongated as shown and is connected with theconduit 44 for the brake operator 43. The openings 59 and 6| areconnected with the conduit 26 for the clutch H, and the opening 59 iselongated as shown. The openings 54, 56 and 51 are connected with anysuitable conduits whereby fluid may freely drain through the openings asto a suitable sump (not shown). The valve block BI is provided withanother cylindrical cavity in which is disposed a sleeve 62 havingopenings 63, 64, 65 and 66 formed therein. The openings 63, 64 and 65are in communication, by means of suitable passages in the valve block5|, with the openings 53, 55 and 58 respectively in thesleeve 56, andthe opening 56 is in communication with a conduit 61 which is connectedwith the pump i4 and which thus carries a supply of fluid underpressure.

The valve piston 49 is provided with slots 68 and 69, and the sleeve 56is closed at its ends by caps III which are provided with suitableopenings is swingably mounted with respect to the transmission. The rodI5 is connected by a link 76 with a lever H which is fixed to a shaft 18rotatably disposed in the transmission housing 48. The shaft '18 hasfixed on its inner end a lever 19 which carries a pin 89 on the lowerend of the lever. The link 14 is provided with a slot Bl in its lowerend, and the pin 80 projects into the slot as shown.

The rod I5, the link 14, the valve pistons 49 and H, and the yoke member45 are shown in their neutral positions in the drawings. In the neutralposition of the piston l l, the lands 12 and I3 block the openings 63and 65 respectively in the sleeve 62, and fluid under pressure from theconduit 61 thus cannot fiow through the latter openings. In the neutralposition of the valve piston 49, the slot 68 is in communication withthe openings 55 and 66, and fluid under pressure flows from opening 66through the sleeve 62, the

openings 64 and 55, the slot 68 and the opening 66 to the conduit 44.Fluid under pressure is thereby applied to the brake operator 43, andthe brake 42 is engaged to stop rotation of the shaft l2 and drivenelement 2|. Rotation of the gears 38 and 3| also is thereby stopped, andthe clutch member 33 may be easily engaged with either the teeth 32 onthe gear 3i.

tion with the openings 33 and 31, and any fluidin the conduit 23 isdrained through the opening 33, theslot 33, and the opening 31 which iscon;

nected with suitable drainage passages in the valve block 3|. The clutch"is thereby main-- tained disengaged. a

When the control rod 13 is moved in a clockwise direction as seen inFig. 2, the lever I1 is rotated in a counterclockwise direction as seenin that figure, and the lever 13 is rotated ina' clockwise direction asseen in Fig. 5 and rotates the link 14 in a clockwise direction aboutthe pivotal connection of the link with the piston rod 43. Such movementof the link" moves the valve piston ll to .the left as seen in Fig. 5,and

' the piston thereby connects the sleeve openings 33 and 33, and fluidunder pressure flows from opening 33 through the openings 33 and 33 tothe left end of .the valve piston 43 between the piston and the cap 13adjacent that end of the piston. Such application of fluid underpressure to the piston 43 functions to move the piston to the right asseenin Fig. fi and the yoke member 43 and clutch member 33 are moved ina direction to engage teeth on the clutch member with the Such movementof the valve piston 43 to theright also functions to rotate the lever 14in a clockwise direction about the pin 33 and to move the valve pistonll back to its neutral position to stop fluid flow through It willfurther be apparent that teeth on the clutch member 33 may be engaged asslowly as desired with the teeth 32 simply by correspondingly slowmovement of the control rod 13.

When teeth on the clutch member 33 have been fully engaged with theteeth 32, whereby the transmission is conditioned for low speed inforward drive, the control rod 13 is in a position direction as seen inFig. 2, the positivetype clutch comprising the clutch member 331 andteeth 32 are engaged by the fluid under pressure from .the pump I4acting on the valve piston 43, and the valve piston is moved so as toconnect the pump and the clutch H for engaging the clutch and todisconnect the brake operator 43 and pump I4 for disengaging the brake,

The clutch member 33 and yoke 43 are returned to their neutral positionsby movement of the control rod I3 and thereby the link 14 to the neutralpositions of the rod and link. When the link 14 is moved from a,position rotated clockwise with respect to its position as shown in Fig.5 and corresponding to the position causing full lnterengagement ofteeth on the clutch member 33 and the teeth 32, back toward its neutralposition, the piston II is moved to the rightas seen in the figure toconnect the sleeve openings 33 and 33 whereby fluid under pressure issupplied to the sleeve 33 between the right end of the piston 43 and theadjacent cap, 13. Such movement of the piston II also opens the opening33 as is apparent. The fluid under pressure applied to the valve piston43 functionsto move the piston to the left as seen in the figure, and,on such movement of the piston, fluid between the left end of the pistonand the adjacent cap 13 under pressure for engaging the brake 42.

/ neutral position in a counterclockwise direction rotated clockwisefrom its position shown in Fig.

2, and the lever I3 and link 14 are in positions rotated clockwise fromtheir positions as shown in Fig. 5. In this condition of the controlmechanism, the valve piston 43 is moved to the right as seen in Fig. 5with its right end adjacent the cap 13 at the right end of the sleeve.53, andthe valve piston H is moved to the left as seen in the figure toopen the sleeve opening 33. In this position of the'piston 43, the slot33 isout of communication with the sleeve opening 31, and fluid in theconduit 23 cannot thereby drain from the conduit. The left end of thepiston 43 is moved to open the opening 3i, and the sleeve opening 33 insleeve 32 is connected with the opening 3| by means of openings 33 and33, and fluid under pressure is-thereby supplied to the conduit 23 andto the clutch" for engaging the clutch. The slot 33,1n' this position ofthe piston 43, is in communication with the opening 33, and

- fluid from the conduit 44 is drained therefrom.

through opening 33, slot 33 and opening 33 to disengage "the brake 42.It will thus be apparent that by movement ofgthe rod 13 in a clockwiseWhen the control rod 13 is moved from its as seen in Fig. 2, the lever14, valve pistons 43 and ll and the clutch member 33 are moved similarlyto but .in opposite directions from their movements in the case when thecontrol rod ismoved in a ciockwise direction from itsneutral position.Teeth on the clutch member 33 are thereby engaged with the teeth 33 on.the gear 33 to connect the gear 33 and output shaft ll,

and-the clutch I1 is engaged and the brake 42 is disengaged as isapparent. Poppet means are preferably provided for bot the member 13and. the shaft 43 for yieldingly holding-the member and shat-t in theirpositions corresponding to forward, reverse or neutral conditions of thetransmission. The'poppet means for the member 13 comprises notches32'formed in the member 13, a plunger 33 slid-ably disposed in acylindrical cavity formed .in a portion fixed with respect to thehousing 43, and a spring 34 for yleldingly pressing the plunger into thenotches 82. The notches -3'2 are-so disposed .in

I the member 13 that when the member is in Dosition such that theplunger 33 is in the center notch, the notch on the left or "the notchon the right as seen in (Fig. 5, the member 13 is in itspositioncorresponding to neutral. forward, or reverse condition respectively, ofthe transmission. The

poppet means for the shaft 43 comprises notches 33 in the shaft, aplunger 33slidably disposed in a cylindrical cavity in a portion fixedwith respect,

to the housing 43. and a spring 31 for yieldingly maintaining theplunger in any or the notches on the left or the notch on the right asseen in Fig. 5. the clutch member I! is respectively in its neutralposition with the teeth thereon disengaged from the teeth '3! and 82 orin forward drive position'wi-th the teeth 'on the clutch memberenassaeoe' including the clutch member 23 and teeth 12 and ID, thefriction clutch I1, and the brake 42. These parts may thus be quitelarge in size whereby the transmission is capable of transmitting largetorques for driving heavy vehicles; however, the

:clutches and brakes for completing the forward and reverse power trainsthrough the transmission may nevertheless be easily controlled.

4 I do not intend to limit the invention to the details shown anddescribedt except only insofar ascertain of the appended claims arespecifically rod II and lever 80. The link 80 preferably comprises twolink portions Illa and tilb'between which there is a lost motionconnection, such as a connection of the .pin and slot type. A lever IIis area on the inner end of the shaft 88, and the yoke member 45 isprovided with a slot 02 in which an end of the lever ii is disposed;Assuming that fluid pressureis not present in conduit '81, when I thecontrol rodl'l is moved in a clockwise direction as seen in Fig; ,2, thelever II is moved in a counterclockwise direction'by means of the linkIt, and the lever is moved in a clockwise direction as seen in Fig. 5and moves the yoke member I and the clutch member 33 to engage teeth onthe clutch member with the teeth 32. Thetransmission is therebyconditioned for low speed forward drive by manual operation of theclutch member II. The clutch member 08 may be manually moved back toneutral position by movement of the control rod 16 in a counterclockwisedirecfrom its neutral position to engage teeth thereon with the teeth 39for conditioning thetransmission for reverse drive by continuing suchcounterclocks wise movement of the -control rod, The member it may bereturned to neutral position by manual operation by thereafter movingthe control rod in a clockwise direction as seen in Fig. 2. The lostmotion connection between the link portions Ma and 90b is provided inorder that the link 90 and lever 88 are ordinarily not operative to movethe clutch member 33 when there is fluid under pressure in the conduit61 and the clutch member 33 may thus be engaged'by fluid pres-1, sureacting on the valve piston 49. The manual control means for the clutchmember 33 and including the levers 88 and-9| and the link 90 isparticularly useful for shifting the clutch member 33. when there is nofluid pressure in the conduit 81, as when the vehicle engine is stalled,and the teeth on the clutch member are "engaged with either the teeth 32or 8'8. -If the clutch member 33 were left in engagement with either theteeth 32 or 38 when the vehicle engine is being started, as soon asthere is any rotation of the shaft it due to the crankshaft of theengine being turned, the clutch I! would be engaged, and it would bedimcult to continue to turn the crankshaft to start the engine sincesuch en agement of the clutch l'l would complete a power train throughthe transmission, with the use of the manual control means for theclutch member 38, the clutch member may be moved out of engagement withthe '35 tion, and tlfe clutch member a may be moved so limited. as itwill be apparent that modifications may be made without departingfromthe prin ciples of the invention.

I claim:

. 1. In a transmission, the combination of input and output shafts, apower train between said shafts, a clutch in saidpower train, a secondclutch in said power train, a control mechanically connected with saidfirst-named clutch for engaging the clutch, power operated means foractuating said second clutch, a power operated power control connectedwith and adapted to move the first-named control, asource of power aconnected with said power operatedgneans and, said power operated powercontrol, said power operated power control being disposed operativelybetween said power source and said power operated means for engagingsaid second clutch" when said first clutch is engaged and disengagingsaid second clutch when said first clutch is dis- I engaged. a

2. In a transmission, the combinationof input and output shafts, apowertrain between said shafts, a positive type clutch in'saidv power train,a friction clutch in said power train, a control mechanically connectedwith said. firstnamed clutch for engaging the clutch, fluid pressureoperated means for engaging said friction clutch, a source of fluidpressure, and a valve operated by fluid pressure. and connected with andadapted to move said control for operatively connecting said fluidpressure source and said fluid for disengaging the brake when saidclutch is clutch, a source of power connected with said brake, and apower control connected to move with said first-named control andoperatively dis;- posed between said power source and said brake engagedand for engaging the brake when the clutch is disengaged.

4. In a transmission,the combination of input and output shafts, a powertrain between said teeth 32- or 39 to open the low speed or reverseshafts, a hydrodynamic coupling device in said power train and having adriven element, a positive-type clutch in said power train between saidcoupling device and said output shaft, a

power-operated brake for retarding rotation of the driven element ofsaid coupling device, a control for engaging said clutch, a source ofpower connected with said brake, and a power control connectedto movewith said first-named control and operatively disposed between saidpower source and said brake for disengaging the brake when said clutchis engaged and engaging the brake when the clutch is disengaged.

5. In a transmission, the combination of input and output shafts, apower train between said shafts, a'hydrodynamic coupling device in saidpower train and having a driven element, a positive-type clutch in saidpower train between said device and said output shaft, a controlmechanically connectedwith said clutch for engaging the clutch, a fluidpressure operated brake for retarding rotation of the driven element ofsaid hydrodynamic device, a source of fluid pressure connected with saidbrake, and a valve connected to move with said control and operativelydisposed between said fluid pressure source and said brake fordisengaging the brake when the clutch is engaged.

6. In a transmission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic coupling device in saidpower train and having a driven element, a clutch in said power trainfor connecting said device and said input shaft, a clutch in said powertrain between said device and said output shaft, a brake for the drivenelement of said hydrodynamic device, and a control for said clutches andbrake, said control in one position engaging both of said clutches anddisengaging said brake and in another position disengaging both of saidclutches and engaging said brake.

7. In a transmission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic device in said powertrain and having a driven element, a power-operated clutch in said powertrain for connecting said device and said input shaft, a clutch in saidpower train between said device and said output shaft, a power-operatedbrake for the driven element of said device, a control mechanicallyconnected with said second-named clutch, a source of power connectedwith said first-named clutch and said brake, and a power controlconnected to move with said first-named control and operatively disposedbetween said power source and both said brake and first-named clutch,said controls in one position thereof functioning to disengage saidclutches and to engage said brake and in another position thereoffunctioning to disengage said brake and to engage said clutches.

8; In a transmission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic coupling device in saidpower train and having a driven element, a fluid pressure engaged clutchfor connecting said input shaft and coupling device, a positive-typeclutch in said power train between said device and said output shaft, afluid pressure engaged brake for the driven element of said couplingdevice, a control mechanically connected with said last-named clutch forengaging the clutch, a source of fluid under pressure connected withsaid brake and said first-named clutch, and a valve disposed operativelybetween said power source and both said brake and said first-namedclutch and connected to move with said control,

said control in one position thereof engaging said i second-named clutchand by means of said valve connecting said power source and saidfirstnamed clutch and disconnecting the power source and said brake,said control in another position thereof disengaging said positive-typeclutch and by means of said valve connecting said clutch in said powertrain, a control mechanically connected with said first-named clutch forengaging the clutch, power-operated means for actuating said secondclutch, a source of power connected with said power-operated means, apower control connected to move with said flrstnamed control anddisposed operatively between said power source and said power-operatedmeans for engaging said second clutch when said first clutch is engagedand disengaging said second clutch when said first clutch is disengaged;said power source also being connected withsaid controls for actuatingthe controls, and another control operatively disposed between saidfirst and second named controls and said power source whereby the twofirst-named controls may be moved between their clutch-engaging anddisengaging positions.

10. In a transmission, the combination of input and output shafts. apower train between said shafts, a positive type clutch in said powertrain, a friction clutch in said power train, a control mechanicallyconnected with said first-named clutch for engaging the clutch, fluidpressure operated means for engaging said friction clutch, a source offluid pressure, and a valve connected to move with said control foroperatively connecting said fluid pressure source and said fluidpressure operated means for engaging said friction clutch when saidpositive type clutch is engaged, said fluid pressure source also beingconnected with said valve for actuating the valve, and another valveoperatively disposed between said first-named valve and said fluidpressure source whereby fluid pressure may be applied to saidfirst-named valve to move it and said control between theirclutch-engaging and disengaging positions.

11. In a transmission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic coupling device in saidpower train and having a driven element. a clutch in said power train, apower-operated brake for retarding rotation of the driven element ofsaid coupling device, a control for actuating said clutch, a source ofpower connected with said brake, a power control connected to move withsaid first-named control and operatively disposed between said powersource and said brake for disengaging the brake when said clutch isengaged and for engaging the brake when the clutch is disengaged, saidpower source also being connected with said controls for moving thecontrols, and another power control operatively disposed between saidfirst-named controls and said power source whereby power may be appliedto said first-named controls to move them between their clutch-engagingand disengaging positions.

12. In a transmission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic coupling device in saidpower train and having a driven element, a positive type clutch in saidpower train between said device andsaid output shaft, a controlmechanically connected with said clutch for actuating the clutch, afluid pressure operated brake for retarding rotation of the drivenelement of said hydrodynamic device, a source of fluid pressureconnected with said brake, a valve connected to move with said controland operatively disposed between said fluid pressure source and saidbrake for disengaging the brake when the clutch is engazed, said fluidpressure source also being consuch that said first-named valve and thecon-'- trol connected therewith are moved distances corresponding to thedistances said control member is moved.

13. In a'transrnission, the combination of input and output shafts, apower train between said shafts, a hydrodynamic coupling device'in saidpower train and having adriven element, a power-operated clutch in saidpower train for connecting said device and said input shaft, a clutch insaid power train between said device and said output shaft, apower-operated brake for the driven element of said device, a controlmechanically connected with said second-named clutch, a source of powerconnectedwith said first-named clutch and said brake, a power controlmovable with said first-named control and operatively disposed betweensaid power source and both said brake and first-named clutch, saidcontrols in one position thereof functioning to disengage said clutchesand to engage said brake and in another position thereof functioning todisengage said brake and to engage said clutches;

vice and said output shaft, a fluid pressure engaged brake for thedriven element of said coupling device, a control mechanically connectedwith said last-named clutch for engaging the clutch, a source of fluidunder pressure connected with said brake and said first-named clutch, avalve operatively disposed between said fluid pressure source and bothsaid brake and said first-named clutch and movable with said control,said control in one position thereof engaging said positive type clutchand by means of said valve connecting said fluid pressure source andsaid flrst-namedclutch and disconnecting the fluid pressure source andsaid brake, said control in another position thereof disengaging saidpositive type clutch and by means of said valve connecting said fluidpressure source and said brake and disconnecting the fluid pressuresource and said first-named clutch, said fluid .../pressure source alsobeing connected with said valve for moving the valve, and another valveoperatively disposed between said first-named valve and said fluidpressure source and a control member interconnecting said two valves,the arrangement being such that said first-named valve and said controlare moved distances corresponding to the distances said control memberis moved.

15. In a variable speed power transmitting device, a plurality ofengageable elements for efresting changes in speed ratio in the device,fluid means for operating said elements and means for controlling thefluid means, said last mentioned means comprising a piston forcontrolling at least one of said elements and a manually operablefollow-up valve for controlling the position of said piston, said pistonalso serving as a valve to control the remaining elements.

16. In a variable speed power transmitting device, a plurality ofengageable elements for effecting changes in speed ratio in the device,a piston mechanically connected with at least one of said elements foroperatin it, a manually operable follow-up valve for controlling theposition of said piston, and fluid means for operating the remainingelements, said piston also serving as a valve to control the remainingelements.

17. In a variable speed power transmitting device, a plurality ofengageable elements for effecting changes in speed ratio in the deviceand including a positive type clutch and a friction clutch, a pistonmechanically connected with the positive type clutch for operatin it andfluid means for operating the remaining elements including the frictionclutch, and a manually operable follow-up valve for controlling theposition of said piston, said piston also serving as a valve to controlsaid remaining elements.

18. In a variable speed power transmitting device, an engageable elementfor effecting a change in speed ratio in the device, a fluid operatedmember connected with said element for positioning it, a mechanicallyoperated member connected with said element for positioning it, a sourceof fluid under pressure, valve means controlling said fluid underpressure and thereby controlling the position of said fluid operatedmember, and a manual control connected with .and adapted to move saidmechanically operated member and said valve means to cause movement ofsaid engageable element, the connection between the manual control andsaid mechanically operated member providing lost motion, wherebyshifting of the manual control may move the valve means without directlymoving the mechanically operated member.

19. In a variable speed power transmitting device, a clutch foreffecting a change in speed ratio in the device, a fluid operated pistonconnected with said clutch for positioning it, amechanically operatedmember connected with said clutch for positioning it, a source of fluidunder pressure, a valve controlling said fluid under pressure andthereby controlling the position of said fluid operated piston, and amanual control connected with and adapted to move said mechanicallyoperated member and said valve to cause movement of said clutch, theconnection between the manual control and said mechanically operatedmember providing lost motion, whereby shifting of the manual control maymove the valve without directly moving the mechanically operated member.

20. In a variable speed power transmitting device, a plurality ofengageable elements for effectlng changes in speed ratio in the device,a fluid operated member connected with at least one oi said elements forpositioning it, a mechanically operated member connected with said oneelement for positioning it, a source of fluid under pressure connectedwith said fluid operated member and said other engageable elements,valve means between said source of pressure and said fluid operatedmember for controlling the position of that member, and a manual controlconnected with and adapted to move 'said mechanically operated memberand said valve means trol and said mechanically operated memberproviding a lost motion whereby shifting of the manual control may movethe valve means without directly moving the mechanically operatedmember, said fluid operated member also serving as a valve to controlthe remaining engageable elements.

21. In a variable speed power transmitting device which includes ahydrodynamic coupling device having a driven element, a plurality ofengageable elements for effecting changes in speed ratio in the powertransmitting device and including a positive type clutch, a fluidpressure engaged friction clutch and a fiuid'pressure en gaged brake forthe driven element of the coupling device, a fluid operated pistonconnected with said positivetype clutch for positioning it, amechanically operated member connected with said positive type clutchfor positioning it, a source of fluid under pressure connected with saidbrake and said friction clutch, said fluid operated piston also servingas a valve to control the supply of fluid pressure-to said frictionclutch and said brake. other valve means controlling the fluid underpressure and thereby controlling the position of said fluid operatedpiston, a man- 19 ual control connected with and adapted to move saidmechanically operated member and said last-mentioned valve means tocause movement of said positive type clutch, the connection between themanual control and said mechanically operated member providing lostmotion, whereby shifting of the manual control may move the valvewithout directly'moving the mechanically operated member.

B. BYRON LE MAY, JR. 1

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

